Message type: E = Error
Message class:  CNV_LTHCM_S_10 - LT HCM: Message Class for Data Selection 
Message number: 126
Message text: &1 tables excluded, as tables contain no data
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message CNV_LTHCM_S_10126 indicates that certain tables have been excluded from a conversion or migration process because they contain no data. This message is typically encountered during data migration activities, especially when using SAP's Landscape Transformation (LT) tools or during the conversion to S/4HANA.
Cause: The primary cause of this error message is that the specified tables do not contain any records. During the data migration process, the system checks the tables to determine if they have data to be migrated. If a table is found to be empty, it is excluded from the migration process, and this message is generated.
Solution: Verify Table Contents: Check the tables mentioned in the error message to confirm that they are indeed empty. You can do this by executing a simple SQL query or using transaction codes like SE11 or SE16 to view the table contents. Assess Data Requirements: Determine if the absence of data in
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_LTHCM_S_10125 Table group &1 (&2) is included
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_LTHCM_S_10124 HCM table &1 does not contain any data
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_LTHCM_S_10128 &1 special selection entries are deactivated, as tables contain no data
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_LTHCM_S_10129 Table &1 requiring special selection does not contain any data
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.